Ditmars Boulevard (originally Ditmars Avenue) is a street located in the northwest corner of Queens, New York.

It runs from its intersection with the East River in Astoria (the corner of Shore Boulevard), just to the north of Astoria Park. The road continues to the east until it reaches the western edge of LaGuardia Airport, ending at the intersection of 81st and 82nd Street north of Bowery Bay Boulevard. Then the road starts again at 23rd Avenue and 86th Street and runs along the southern edge of LaGuardia Airport until reach Astoria Boulevard and 111th Street in East Elmhurst.

The earliest Ditmars ancestor was Jan Jansen Ditmarsen (John the Son of John from Ditmars) who immigrated to America from Holstein in Germany. The first Ditmars settled in Dutch Kills about 1647. Ditmars Boulevard and the East River was the site of Dr. Dow Ditmars' home. The doctor, who died in 1860 at 90, was held in high esteem by the community. A son, Abram Ditmars, later became the first Mayor of Long Island City in 1870.[1] Later, Steinway and Sons, the piano manufacturer, had a final assembly factory on Ditmars Boulevard until the 1960s.[2]